We present U and B galaxy number counts from a field that comprises a 0.29 square degrees area of sky, and which covers the Groth-Westphal Strip (Groth et al.,1994). Reached 50% limiting magnitudes are 24.8 magnitudes in U and 25.5 in B in the Vega system, which makes our U number counts to have the biggest area×depth product at the moment. These

The Global Oscillations at Low Frequency: New Generation instrument (GOLF-NG), the successor of GOLF aboard SoHO, is devoted to the study the dynamics of the solar radiative zone thanks to the detection of solar gravity modes and low-frequency acoustic modes. This instrument built under a French-Spanish collaboration, is based on the Doppler

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We summarize our work on structures in different stages of aggregation, and spanning a wide range in redshift. We emphasize our work on high resdhift clusters. This comprises the analysis of ~ 7 square degrees using deep images with several broad-band optical filters. We plan to complement these with near IR observations in 4 m class telescopes

Large telescopes require a very precise calibration in order to maximize its scientific output. Current catalogues of standard stars are generally too bright for 10m telescopes. For GTC we are planning to produce a catalogue with calibration stars which are suitable for this telescope. In this paper we describe the first steps of the GTC

After revisiting the hierarchy problem of the Standard Model and its implications for the scale of New Physics, I consider the finetuning problem in two main scenarios beyond the Standard Model: Supersymmetry (both in the Minimal Supersymmetric Standard Model and alternative models) and Little Higgs models. The main conclusions are that New Physics